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StatsToDo : Sample Size for Comparing 2 Means
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## StatsToDo: Sample Size for Comaring Two Means

Explanations and References Sample Size Tables Javascript Programs
 Data Sample Size: Data a table of 4 columns   - Each row contains data from a separate study   - Col 1 = Probability of Type I Error α   - Col 2 = Power (1 - β)   - Col 3 = Difference Between the Two Means to be Detected   - Col 4 = Expected Within Group Standard Deviation       Power: Data a table of 6 columns   - Each row contains data from a separate study   - Col 1 = probability of Type I error (α)   - Col 2 = Differences between group means observed   - Col 3, 5 = sample size used in Group 1 & 2   - Col 4, 6 = Observed Standard Deviation of Group 1 & 2       Confidence Interval: Data a table of 5 columns   - Each row contains data from a separate study   - Col 1 = Percent confidence (usually 95 or 99)   - Col 2, 4 = sample size group 1 & 2   - Col 3, 5 = Standard Deviation group 1 & 2       Pilot Study: Data is for a single plan, a single column with 4 rows   - Row 1 = Percent confidence required, usually 95 or 99   - Row 2 = within Group or pupulation Standard Deviation   - Row 3 = Sample size intervals   - Row 4 = Maximum sample size
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